Norman clark



(No Model.)

.N. CLARK.

TREADLE MECHANISM.

Patented Dec. 2,1890.

UNITED STATES ATENT OFFICE.

f NORMAN CLARK OF STERLING, ILLINOIS, ASSIGNOROF ON E-HALE TO SOLOMON P. GIDDINGS, OF SAME PLACE.

= TREADLE MECHANISM.

SPECIFICATION forming part of Letters Patent No. 441,748, dated December 2, 1890. Application filed March 18, 1890- Serial No. 344,431. (No model.) 7

To all whom it may concern:

Be it known thatI, NORMAN CLARK, a citizen of the United States, residing at Sterling,

in the county of Whiteside and State of ,I'lliings, and to the letters of reference marked thereon, which form apart of this specification. Y Y

My-invention-has reference to improvements in treadle mechanism; and the object of my invention is .to provide a treadle which shall have the following advantages, to wit: that the treadle shall be simple, noiseless, and easily operated. I attain this object by the construction shown inthe drawings, in which Figure 1 is a perspective; somewhat oblique,

of my inventionl Fig. 2 is a detailof aportion of the treadle mechanism; 1 Fig.3 is a view of the under side of the pedal. Fig. 4 is a detail view of the crank-pin.

A.A are the ends of the bench, which are preferably made of some suitable metal, and cast of an open character to 'interpose the least obstruction to the passage of the light under the bench. The ends A A may embody variantforms and be made ornamental, of the design shown in Fig. l, or otherwise.

Gis the driving band-wheel'pivotally seated upon a horizontal stud l-I, projected inwardly from the inner side of the adjacent end A.

J is a crank-pin formed upon the inner side of oneof the spokes of the wheel G. A pedallever K is pivotally attached at its upper end to the inner surface of the end A through the medium of a short horizontal stud L, whereby it is adapted to oscillate to and from the operator in a vertical plane.

Curved arms M M, integral with or attached to the lever K, extend from the latter toward the rear of the machine and at their rear eX- tremities form ajunction. A flat spring N is interposed between the open ends of the arms M, and by means of a hole formed vertically-through that portion of the spring N which is clamped between the back ends of the braces Maud the vertical bolt 0 the back end of the spring N is held rigidly.

A box-journal P is loosely seated on the tions, but with greater efficiency and withoutany. noise.

One arm M will be sufficient, and that may be projected from different localities on lever K, the sole requisite of such arm being to rigidly sustain spring Nat its outer end and not obstruct the oscillation of said spring.

. Aside from the advantages just named of the spring N, a very important advantage consists in the fact that said spring assists ,to

throw the crank-pin J past the dead-points in the orbital rotation of thelatter bytheresilient pressure of said spring upon' said crank-pin as the latter approaches its dead-points. The two points in the orbit of the crank-pin J at which the lever K can exert no power thereon are those in line with the outer end of the arms M and the hub or center of the wheel G. The crank-pin J approaches one of these points from above and the other from below, as shown inFig. 2. Just before the crank-pin J reaches one of said dead-points thespring N, being drawn out of its normal straight condition, as shown in Fig. 2, (in which situation its tendency is to return to its straight or normal position,) has the effect of carrying the crank-pin J toward thedead-point and with its acquired momentum slightly beyond. revolution of the wheel G, lessens the jar or pulsation of passing said dead-points and This action, occurring twice in every renders the operation of thelever K very 'ef- IOO tel stud U is projected inward from the lower end of the lever K and passed loosely through depending ears T, formed on the sides of the pedal T and extending a short distance below the latter.

A spring V is attached rigidly to the bottom of the heel or lower portion of the pedal T and has its free end projected into a recess 1V, formed about centrally in the lower surface of the fixed pin U. In placing the pedal T on the lever K it is sufficient to simplydraw the open end of the springV down far enough to clear the ears T, in which condition the pedalT can be passed upon the stud U. The spring V, being then released, is carried by its own elasticity forcibly into the recess 7, and, the lower surface of the stud U in the recess WV being horizontal, the pressure of the spring V thereon tends to hold the treadle T in one uniform positionto wit, about horizontal and clear of the floor. By forcing the free end of the spring downward sufficiently to clear the ears T the pedal T can be removed for the purpose of shipment or otherwise. Thus the spring V performs the double function of servingas a retaining device of the pedal T and also to hold the latter in a substantially horizontal position, and therefore to be readily found by the foot of the operator. The elasticity of the spring V permits it to rock over the edges of the recess W during the oscillation of the lever K, so as to permit the treadle T to adjust itself to the changing positions of the operators foot. 7

The watch-rack X is removably attached to the bench by its vertical posts X being slightly stepped in the upper surface of the top B and short horizontal screws inserted into said posts from the crest to the rear railing F.

The usual belt3 is carried upward from the wheel G, through suitable openings l in the top B, to the countershaft V, which latter is belted in the usual way to the lathe Z.

What I claim as my invention, and desire to secure by Letters Patentof the United States, is

1. In a treadle mechanism, the combination of the band-wheel G, provided with crank-pin J, the lever K, provided with projecting arm or arms M, box P, and spring N, substantially as shown, and for the purpose described 2. The combination of the driving-wheel G, provided with crank-pin J, the pedal-lever K, suitably pivoted at its upper end and provided with rearward extension M, a journal or box 1?, pivotally seated on pin J, and the spring N, rigidly seated at one end in the end of the extension M and at its other end in the box P, substantially as shown, and for the purpose described.

3. The combination of the pedal-lever K, horizontal stud U, provided with recess \V, pedal T, provided with ears T, and spring V, rigidly attached at one end to the lower surface of the. pedal T and having its free end projected under the stud U and within the recess \V therein, substantially as shown, and

for the purpose described.

4. 111 a treadle mechanism, the combination of the band-wheel G, crank-pin J, seated on the inner side thereof, the pedal-lever K, pivotally suspended at its upper end and provided with projection M, box P, spring N, pedal T, provided with ears T, stud U, provided with recess W, and spring V, substantially as shown, and for the purpose described.

In testimony whereof Iafiix my signature in presence of two witnesses.

NORMAN CLARK.

Witnesses:

JONATHAN A. MORGAN, W. A. MURPHY. 

